rcu: Permit call_rcu() from CPU_DYING notifiers
[linux-2.6.git] / kernel / lockdep_internals.h
index a2ee95a..4f560cf 100644 (file)
@@ -110,30 +110,60 @@ lockdep_count_backward_deps(struct lock_class *class)
 #endif
 
 #ifdef CONFIG_DEBUG_LOCKDEP
+
+#include <asm/local.h>
 /*
- * Various lockdep statistics:
+ * Various lockdep statistics.
+ * We want them per cpu as they are often accessed in fast path
+ * and we want to avoid too much cache bouncing.
  */
-extern atomic_t chain_lookup_hits;
-extern atomic_t chain_lookup_misses;
-extern atomic_t hardirqs_on_events;
-extern atomic_t hardirqs_off_events;
-extern atomic_t redundant_hardirqs_on;
-extern atomic_t redundant_hardirqs_off;
-extern atomic_t softirqs_on_events;
-extern atomic_t softirqs_off_events;
-extern atomic_t redundant_softirqs_on;
-extern atomic_t redundant_softirqs_off;
-extern atomic_t nr_unused_locks;
-extern atomic_t nr_cyclic_checks;
-extern atomic_t nr_cyclic_check_recursions;
-extern atomic_t nr_find_usage_forwards_checks;
-extern atomic_t nr_find_usage_forwards_recursions;
-extern atomic_t nr_find_usage_backwards_checks;
-extern atomic_t nr_find_usage_backwards_recursions;
-# define debug_atomic_inc(ptr)         atomic_inc(ptr)
-# define debug_atomic_dec(ptr)         atomic_dec(ptr)
-# define debug_atomic_read(ptr)                atomic_read(ptr)
+struct lockdep_stats {
+       int     chain_lookup_hits;
+       int     chain_lookup_misses;
+       int     hardirqs_on_events;
+       int     hardirqs_off_events;
+       int     redundant_hardirqs_on;
+       int     redundant_hardirqs_off;
+       int     softirqs_on_events;
+       int     softirqs_off_events;
+       int     redundant_softirqs_on;
+       int     redundant_softirqs_off;
+       int     nr_unused_locks;
+       int     nr_cyclic_checks;
+       int     nr_cyclic_check_recursions;
+       int     nr_find_usage_forwards_checks;
+       int     nr_find_usage_forwards_recursions;
+       int     nr_find_usage_backwards_checks;
+       int     nr_find_usage_backwards_recursions;
+};
+
+DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
+
+#define __debug_atomic_inc(ptr)                                        \
+       this_cpu_inc(lockdep_stats.ptr);
+
+#define debug_atomic_inc(ptr)                  {               \
+       WARN_ON_ONCE(!irqs_disabled());                         \
+       __this_cpu_inc(lockdep_stats.ptr);                      \
+}
+
+#define debug_atomic_dec(ptr)                  {               \
+       WARN_ON_ONCE(!irqs_disabled());                         \
+       __this_cpu_dec(lockdep_stats.ptr);                      \
+}
+
+#define debug_atomic_read(ptr)         ({                              \
+       struct lockdep_stats *__cpu_lockdep_stats;                      \
+       unsigned long long __total = 0;                                 \
+       int __cpu;                                                      \
+       for_each_possible_cpu(__cpu) {                                  \
+               __cpu_lockdep_stats = &per_cpu(lockdep_stats, __cpu);   \
+               __total += __cpu_lockdep_stats->ptr;                    \
+       }                                                               \
+       __total;                                                        \
+})
 #else
+# define __debug_atomic_inc(ptr)       do { } while (0)
 # define debug_atomic_inc(ptr)         do { } while (0)
 # define debug_atomic_dec(ptr)         do { } while (0)
 # define debug_atomic_read(ptr)                0